Ruka is een jong meisje wiens ouders gescheiden zijn en wiens vader in een aquarium werkt. Wanneer twee jongens, Umi en Sora, die door doejongs in de zee zijn opgevoed, naar het aquarium worden gebracht, voelt Ruka zich tot hen aangetrokken en begint ze te beseffen dat ze dezelfde soort bovennatuurlijke verbinding met de oceaan heeft als hen. De speciale kracht van Umi en Sora lijkt verband te houden met vreemde gebeurtenissen die steeds vaker voorkomen, zoals het verschijnen van zeedieren ver van hun thuisgebied en het verdwijnen van aquariumdieren over de hele wereld.
Nee, helaas is 海獣の子供 nog niet beschikbaar op Netflix in Nederland.
| Visual Effects | 山本健 | Key Animation |
| Visual Effects | Eri Taguchi | Key Animation |
| Visual Effects | 小西賢一 | Supervising Animation Director |
| Directing | 小西賢一 | Second Unit Director |
| Writing | Saku Konohana | Screenplay |
| Writing | 五十嵐大介 | Comic Book |
| Visual Effects | Miyuki Ito | Color Designer |
| Sound | 笠松 広司 | Sound Director |
| Sound | 米津玄師 | Theme Song Performance |
| Visual Effects | 秦綾子 | Animation Director |
| Visual Effects | 下司祐也 | Animation Director |
| Visual Effects | 村上泉 | Animation Director |
| Visual Effects | 下司祐也 | Key Animation |
| Visual Effects | 西田達三 | Key Animation |
| Visual Effects | Kaori Hayashi | Key Animation |
| Visual Effects | 嶋田真恵 | Key Animation |
| Visual Effects | 板垣彰子 | Key Animation |
| Visual Effects | 町田菜保子 | Key Animation |
| Visual Effects | 薮本和彦 | Key Animation |
| Visual Effects | 関みなみ | Key Animation |
| Visual Effects | 村上泉 | Key Animation |
| Visual Effects | 篠田知宏 | Key Animation |
| Visual Effects | 小島大和 | Key Animation |
| Visual Effects | 秦綾子 | Key Animation |
| Visual Effects | 向田隆 | Key Animation |
| Visual Effects | Masahiko Kubo | Key Animation |
| Visual Effects | 八崎健二 | Key Animation |
| Visual Effects | 鴨居知世 | Key Animation |
| Visual Effects | Yukiko Nagao | Key Animation |
| Visual Effects | 小林麻衣子 | Key Animation |
| Visual Effects | 田中孝弘 | Key Animation |
| Visual Effects | 加来哲郎 | Key Animation |
| Visual Effects | 君島繁 | Key Animation |
| Visual Effects | 古川良太 | Key Animation |
| Visual Effects | 世良悠子 | Key Animation |
| Visual Effects | 清水保行 | Key Animation |
| Visual Effects | 石川佳代子 | Key Animation |
| Visual Effects | 千葉ゆみ | Key Animation |
| Visual Effects | 伊本龍守 | Key Animation |
| Visual Effects | 長谷川早紀 | Key Animation |
| Visual Effects | Yuki Oomori | Key Animation |
| Visual Effects | 秋田学 | Key Animation |
| Visual Effects | 白井孝奈 | Key Animation |
| Visual Effects | 曽々木安恵 | Key Animation |
| Visual Effects | 二松真理 | Key Animation |
| Visual Effects | 田津奈々子 | Key Animation |
| Visual Effects | 栗原美樹 | Key Animation |
| Visual Effects | 久保聡一郎 | Key Animation |
| Visual Effects | Manami Sugimoto | Key Animation |
| Visual Effects | 松永絵美 | Key Animation |
| Visual Effects | 小池沙央里 | Key Animation |
| Visual Effects | 小室有土 | Key Animation |
| Visual Effects | 山本悦子 | Key Animation |
| Visual Effects | 小室裕一郎 | Key Animation |
| Visual Effects | Yuta Yokoo | Key Animation |
| Visual Effects | 杉浦英之 | Key Animation |
| Visual Effects | 山口賢一 | Key Animation |
| Visual Effects | 石川晋吾 | Key Animation |
| Visual Effects | Yoshiko Hoshi | Key Animation |
| Visual Effects | 斉藤拓也 | Key Animation |
| Visual Effects | 太田里香 | Key Animation |
| Visual Effects | 刈谷仁美 | Key Animation |
| Visual Effects | ちな | Key Animation |
| Visual Effects | 今村亮 | Key Animation |
| Visual Effects | 伊礼えり | Key Animation |
| Visual Effects | Yosuke Kudo | Key Animation |
| Visual Effects | 亀澤蘭 | Key Animation |
| Visual Effects | 谷田部透湖 | Key Animation |
| Visual Effects | 原科大樹 | Key Animation |
| Visual Effects | 道解慎太郎 | Key Animation |
| Visual Effects | 古屋勝悟 | Key Animation |
| Visual Effects | 青山浩行 | Key Animation |
| Visual Effects | Ryo Konishi | Key Animation |
| Art | 伊奈涼子 | Background Designer |
| Art | 荒井貞幸 | Background Designer |
| Art | Sara Hasegawa | Background Designer |
| Art | 西村美香 | Background Designer |
| Art | Aiwa Narihata | Background Designer |
| Sound | 山口美香 | Foley Artist |
| Sound | 笠松 広司 | Sound Effects |
| Production | 沢辺伸政 | Co-Producer |
| Production | Ayumi Inoguchi | Co-Producer |
| Visual Effects | Kenichiro Akimoto | CGI Director |
| Production | 高橋亜希人 | Associate Producer |
| Production | 岡本順哉 | Associate Producer |
| Production | 田中栄子 | Executive Producer |
| Production | 田中栄子 | Producer |
| Production | Keiji Kameyama | Executive Producer |
| Production | 久保雅一 | Executive Producer |
| Production | 大田圭二 | Executive Producer |
| Production | Kimihisa Tsutsui | Executive Producer |
| Production | Hajime Inoue | Executive Producer |
| Production | 趙小燕 | Executive Producer |
| Crew | Miyuki Ito | Special Effects |
| Editing | 廣瀬清志 | Editor |
| Art | 林孝輔 | Background Designer |
| Visual Effects | Takafumi Ishida | CG Animator |
| Visual Effects | Takanori Nakajima | CG Animator |
| Directing | 渡辺歩 | Director |
| Visual Effects | 小西賢一 | Character Designer |
| Art | 木村真二 | Art Direction |
| Sound | 久石譲 | Original Music Composer |
| Visual Effects | もああん | Key Animation |
| Visual Effects | 묘운 | Key Animation |
| Visual Effects | Alex Boil | CG Artist |
